Who are top 5 donors to Obama, Romney campaigns?

WASHINGTON — Who are the biggest donors to the campaigns of President Barack Obama and Republican challenger Mitt Romney? The Associated Press examined more than 2.3 million campaign contributions and ranked the top five financial supporters for each.

The largest declared donor overall is casino mogul Sheldon Adelson, who is worth an estimated $25 billion. He has donated $34.2 million so far to aid Romney and organizations supporting Romney this election.

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All five of the top Romney donors gave more money than the top Obama donor, movie producer Jeffrey Katzenberg.

Big-dollar donors can have big influence. They are often invited to state dinners at the White House and other events with the president. They also may be asked to weigh in on public policy, especially if it affects their financial interests. And the ranks of ambassadors, advisory panels and other government jobs traditionally are filled with those who have been generous during the campaign.

Katzenberg is Obama's top donor when tallying his contributions to a "super" political committee, money to Obama's campaign and the money he arranged for others to write for the president. The biggest contributions include $2 million to the Priorities USA Action super PAC. It was founded by former White House advisers and is the key pro-Obama PAC this election cycle. Katzenberg has helped "bundle" more than $500,000 for the president's second term, making him among the campaign's top volunteer fundraisers. He's also given more than $66,000 to Obama's campaign and the Democratic Party. The Hollywood icon has been invited to White House events, including a state dinner. Such high-profile soirées put him in proximity earlier this year to Chinese Vice President Xi Jinping, who signed off on an overseas deal benefiting Katzenberg's studio.

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No. 2: Irwin Jacobs, 78, the founder and former chairman of Qualcomm.

Total: $2.122 million

Jacobs has given more than $2 million to pro-Obama super PACs and about $23,000 directly to Obama's campaign and the Democrats. But he's no newcomer to political giving: The billionaire has routinely backed San Diego-area politicians. Some of his local proposals include one backed by San Diego's mayor that would have changed the name of Qualcomm Stadium for 10 days to reflect the cellphone maker's new computer chip.

Eychaner has given $1.5 million to the Priorities USA Action super PAC. He's also given more than $60,000 to the president's re-election committees, and he's listed as a major "bundler" for Obama, having raised at least $500,000 for the president. Eychaner, a gay-rights activist, also has donated millions to other nonprofit groups, including more than $1 million to the progressive EMILY's List organization. He's visited the White House several times since early 2009, according to records, and Obama appointed Eychaner to the board of trustees of the John F. Kennedy Center for the Performing Arts.